Centrifugal screening machines



Nov. 28, 1961 R. BUIZERT CENTRIFUGAL SCREENING MACHINES Filed April 2, 1958 \\\\\\\\\\\\\\\\\N\N\\\ \\\N\\\\\` FIC-3.1

United States Patent hice 3,010,582 Patented Nov. 28, 1961 3,010,582 CENTRIFUGAL SCREENING MACHINES Rokus Buizert, Rijswijk (Z.H.), Netherlands, assignor to Machinefabriek Reineveld N.V., Delft, Netherlands,

a company of the Netherlands Filed Apr. 2, 1958, Ser. No. 725,844 Claims priority, application Germany Apr. 9, 1957 1 Claim. (Cl. ZIO- 370) This invention relates to centrifugal machines of the type provided with a conical screening drum adapted, during operation, to vibrate in axial direction in order to increase the tendency of solids deposited on the inner face of the screen to move towards the wide, open end thereof.

An object of the invention is to provide an improved centrifugal machine construction which is very simple and yet highly efficient.

With this object in view, the invention proposes a shaft for carrying the screening drum which shaft is axially movable in a hollow shaft which is provided for driving the drum and is associated with a suitable vibratOI.

The annexed, somewhat diagrammatic drawing illustrates, in FIG. 1, an axial sectional view of a first embodiment of the invention, and in FIG. 2 a similar view of part of a second embodiment.

According to the invention, a conical screening drum is secured, by means of blades 10a, to a cone or conical member 11, which is connected, through a strong rubber membrane 12, to the upper end of a hollow shaft 13. Said Shaft is rotatably mounted in a casing 14 but is prevented from axial movement therein, and is adapted to be driven by means of a pulley 15. At its upper end, the cone 11 is secured to the upper end of a shaft 16 coaxially mounted in the hollow shaft 13 with a certain amount of clearance, so as to have some freedom of axial movement therein. The lower end of shaft 16 is rotatably mounted, by bearings 17, in a casing 18, but is prevented from axial movement relative thereto. The casing 18 is associated with a vibrator 19 of any suitable design and is resiliently supported in the casing 14 by means of coiled springs 20. Thus, said vibrator is adapted, during operation, to impart axial vibration to the unit comprising the shaft 16, the cone 11 and the screen 10.

The material to be subjected to centrifugal separation is introduced through the nozzle 21.

In the embodiment just described, the rotary movement i 16, 11, 10 by means of the rubber membrane 12. In the second embodiment, illustrated in FIG. 2, the shaft 16 is prevented from rotation relative to the hollow shaft 13 by means of keys 22, which permit axial relative movement of said shafts. Thus, said keys substitute for the membrane 12 shown in PIG. 1.

The drum 10 is provided with perforations 26. The housing 27 is separated by the wall 24 into an upper and a lower part. The wall 24 extends from the outer wall of the housing to the lower edge of the drum 10. The liquid which is separated from the solids by the action of the centrifugal force is forced through the perforations 26 and can be carried olf through the outlet pipe 25. The solids are discharged through the annular orifice 28 between the lower edges of the cone 11 and the drum 10. These solids are deposited in the lower part of the housing 27. The upper end of the housing 27 is covered by a plate 23.

In the machine according to the invention a mixture of solids and liquids is treated.

What I claim is:

A centrifugal machine comprising a conical screening drum, a conical member coaxially within and rigidly connected to said screening drum, said member and drum being in substantially parallel relation, a hollow rotatable shaft, means for rotating said shaft, said drum and member being coaxially aligned with said shaft, a disc-shaped membrane encircling said shaft and connecting said member to said shaft, means supporting the shaft for rotation but xing the same against axial and radial displacements, said membrane transmitting rotary motion of the shaft to said member but being flexible to permit axial displacements of the latter, a rod journalled within said shaft for rotation and axial displacement therein, resilient means between said rod and said shaft and permitting axial displacement of the rod relative to said shaft, and vibrating means connected to said rod to oscillate the same in axial direction.

References Cited in the file of this patent UNITED STATES PATENTS 482,323 Seymour Sept. 6, 1892 498,823 Seymour June 6, 1893 2,732,073 Ruegg Jan. 24, 1956 2,781,130 Heckmann Feb. 12, 1957 2,781,131 Heckmann Feb. 12, 1957 2,782,930 Heckmann Feb. 26, 1957 2,861,691 Linke et al Nov. 25, 1958 2,899,065 Irving Aug. 11, 1959 

